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A porous biomass-based sandwich-structured Co 3 O 4 @Carbon Fiber@Co 3 O 4 composite for high-performance supercapacitors
Carbon ( IF 10.9 ) Pub Date : 2018-04-01 , DOI: 10.1016/j.carbon.2017.12.105
Zijun Shi , Li Xing , Yang Liu , Yanfang Gao , Jinrong Liu

Abstract Enormous research efforts have been made in the field of design and fabrication of material structure of supercapacitors because of the high complexity in obtaining both high energy and power density. Herein, a hierarchical structure of a Co3O4@ biomass-derived carbon fiber @Co3O4 (@BCF@), which consists of hollow porous carbon fiber as the sandwich layer and Co3O4 particles both as an internal shell and an external cladding layer, has been designed and fabricated. Excellent electrochemical performances have been observed for @BCF@ supercapacitors, i.e., high specific capacitance (892 F g−1 at a current density of 0.5 A g−1) and long-term cycling stability (retained 88% even after 6000 cycles). Furthermore, they also exhibit potential application values in asymmetric supercapacitors. The selected biomass-derived hollow carbon fiber with porous structure not only provides an ideal electron transfer path to overcome the limitation of high resistance of most oxide electrodes but also serves as a backbone of inner wall space, which could load more Co3O4 particles per unit electrode area to maximize the redox reaction. Therefore, @BCF@ with sandwich structure is a promising candidate as an electrode material for the development of energy storage devices in the near future.

中文翻译:

用于高性能超级电容器的多孔生物质夹层结构 Co 3 O 4 @Carbon Fiber@Co 3 O 4 复合材料

摘要 由于获得高能量密度和功率密度的高度复杂性,超级电容器材料结构的设计和制造领域进行了大量研究。在此,设计了一种 Co3O4@生物质衍生碳纤维@Co3O4(@BCF@)的分层结构,它由中空多孔碳纤维作为夹层,Co3O4 颗粒作为内壳和外包层组成。和捏造。已经观察到@BCF@ 超级电容器具有优异的电化学性能,即高比电容(892 F g-1,电流密度为 0.5 A g-1)和长期循环稳定性(即使在 6000 次循环后仍保持 88%)。此外,它们在非对称超级电容器中也表现出潜在的应用价值。选择的具有多孔结构的生物质衍生的中空碳纤维不仅提供了理想的电子传递路径,克服了大多数氧化物电极电阻高的限制,而且作为内壁空间的骨架,可以在每单位电极负载更多的 Co3O4 颗粒面积最大化氧化还原反应。因此,在不久的将来,具有夹心结构的@BCF@ 是一种很有前景的电极材料,可用于开发储能设备。
更新日期:2018-04-01
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